EP0877307B1 - Vorrichtung zum Messung der Position eines Werkstückes in einer Drehmaschine - Google Patents

Vorrichtung zum Messung der Position eines Werkstückes in einer Drehmaschine Download PDF

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Publication number
EP0877307B1
EP0877307B1 EP19980500093 EP98500093A EP0877307B1 EP 0877307 B1 EP0877307 B1 EP 0877307B1 EP 19980500093 EP19980500093 EP 19980500093 EP 98500093 A EP98500093 A EP 98500093A EP 0877307 B1 EP0877307 B1 EP 0877307B1
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EP
European Patent Office
Prior art keywords
workpiece
machined
lathe
scale
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19980500093
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English (en)
French (fr)
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EP0877307A2 (de
EP0877307A3 (de
Inventor
César Arriola Arrizabalaga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danobat SCL
Original Assignee
Danobat SCL
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Filing date
Publication date
Application filed by Danobat SCL filed Critical Danobat SCL
Publication of EP0877307A2 publication Critical patent/EP0877307A2/de
Publication of EP0877307A3 publication Critical patent/EP0877307A3/de
Application granted granted Critical
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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes

Definitions

  • the present invention relates to a length measuring device using optical-electronic means, installed in a machine tool to measure the initial position of the workpiece to be machined, as a reference for the positioning of the tool-holder turret, according to the preamble of claim 1.
  • the workpiece On lathes used to machine cylindrical workpieces in series, e.g. car camshafts, the workpiece is held on the lathe chuck at one end and is machined at one or more points along the shaft, taking the free end of said workpiece as the reference for the position of the machining points.
  • Workpieces loaded in succession do not remain in the same linear position within the chuck with respect to the machining tool: even where the chuck has an internal stop for placing the workpiece, they are not all the same length. Therefore, for each workpiece it is necessary to define the actual position of its free end as a reference for control of the movement of the tool-holder turret during machining.
  • a known device for measuring the reference position uses a flexible feeler head incorporated into the tool-holder turret to measure the reference position on contact with the free end of the workpiece. Because it is flexible, said feeler head produces differences in the measurement depending on the speed at which the turret moves when it engages the workpiece.
  • a thruster separate from the feeler head, is also incorporated into the tool-holder turret, to thrust the workpiece into its final position inside the chuck. The turret must complete successive rotations and movements to activate first the thruster and then the feeler head, followed finally by the tool selected, and must withdraw from the workpiece, transversally, before each rotation, thus taking up additional machine and work feeder time.
  • GB-2168271 describes a method for determining the position of the workpiece to be machined in a machine fitted with NC, using an optical measuring device associated with the tailstock which feeds a signal to the control unit of the real position of the tailstock, the measuring device being installed in the area of the workpiece to be machined.
  • the workpiece is not placed on a fixed chuck of the lathe but rather on a moving table, so that the measurement is made in relation to said table.
  • the tailstock thrusts the workpiece firmly and may deform weak workpieces.
  • the object of the invention is a device to measure a reference position of the workpiece to be machined in a lathe or grinder, incorporated into the machine itself, as defined in claim 1.
  • An embodiment of the device for measuring the position of the workpiece according to the invention is constructed by means of an optical rule supported by a sliding element independent of the tool-holder turret and incorporated into the lathe on the end opposite the workpiece holder. It is able to save the time used by the lathe in positioning the workpiece to be machined while obtaining a consistently accurate measurement since the result of such measurement is not influenced by changes of workpiece length or by the retroactive effect of the workpiece when the chuck grips are tightened.
  • car camshafts are automatically fed in to the lathe by a portal- frame type feeder and are secured at one end only on the lathe's rotary chuck: they are then machined at one or more points along the shaft, from the free end.
  • the measuring device according to the invention means that the turret does not have to complete initial operations to place and measure the position with each workpiece fed in, which takes up between 10% and 20% of the total lathe time per workpiece, at the same time simplifying the automatic work feeder and reducing the space it occupies.
  • Camshafts are delicate components which do not admit sharp impact by the thruster on their ends.
  • the measuring device according to the invention is constructed with a thrust shaft which has a feeler head and incorporates a stroke compensation spring to dampen impact on the workpiece and so not deform it, ensuring that the contact pressure for the measurement is always the same.
  • the same protective damping effect on the measuring apparatus is obtained by coupling the measurement apparatus support plate to the thrust shaft.
  • the thruster shaft is coupled to a piston-driven shank which always completes the same total stroke, at the maximum speed.
  • a preferred embodiment 1 of the device according to the invention for measuring along the axial direction of position 2 of the end of workpiece 3 to be machined, comprises the optical unit for the measurement of lengths provided with the body of the scale 4 and the reader head 5, the support plate 9 of the body of the scale 4 which moves in direction "Z", the hydraulic piston-rod 10 coaxial with the workpiece 3 to be machined which thrusts the shank 10', the thruster shaft 6 coupled to said shank 10' and fitted with a feeler head 11, and a trans-versal joining member 12 of support plate 9 of the body of the scale 4 to the shaft 6.
  • the body of the scale 4 is moved in direction by its support plate 9 and the reader head 5 is fixed to the base 20 of the measuring device 1, the base 20 being attached in turn to the lathe bedplate.
  • the reader head 5 transmits a signal representing the measurement of the position 2 to the electronic unit 7 for the control of the tool-holder turret 8.
  • An example of the measuring unit used, 4,5, is the commercial model Heidenhain LS-106, with a 140 mm long nominal scale.
  • the workpiece to be machined for example a car camshaft
  • the workpiece to be machined is fitted on the lathe's workpiece chuck 13, without tightening the grips.
  • the thruster shaft 6 In its movement 14, the thruster shaft 6 reaches end 3a of the camshaft 2 and thrusts it into the chuck or up to an internal stop on the chuck, and the grips then close.
  • the signal finally transmitted by the reader head 5 represents the reference position 2 according to of the tool-holder movement.
  • the measure for displacement of the tool-holder to machine point 3b of the camshaft does not depend on the placing and securing of the workpiece to be machined, and the tool-holder 8 does not have to rotate more than for the positioning of the tool 8' selected.
  • the support 9 of the measuring apparatus slides on a pair of aligned skids 16 fixed to the housing 17 of the shank 10'.
  • the thruster shaft 6 is coupled to the shank 10'a by a casing 18 which includes two guide bushes for the axial movement of the feeler head 11.
  • the shank 10' completes its full stroke each time, thrusted by the piston at high pressure, e.g. 40 bar, to ensure maximum speed of movement, but the shaft 6 is braked immediately on contact with the workpiece 3, with the help of the overrun compensation spring 19.
  • the feeler head 11 has different configurations on its outer surface and can be removed for replacement, depending on the form of the workpiece 3 to be machined, and so is bolted 21 to the shaft 6.
  • Two superimposed microswitches 22 (fig.
  • the measuring device 1 also has a box-shaped cover around the reader head 5 and the scale 4 of the measuring apparatus.
  • Figure 3 shows the prior art device 1', which has a thruster 11' attached to the tool-holder 8 to thrust the workpiece 3 to its stable position.
  • the tool-holder then rotates to place the flexible feeder 24 in contact with the end 3 in order to measure the reference position 2, and rotates the tool-holder 8 once more to position the tool 8' selected.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Machine Tool Sensing Apparatuses (AREA)
  • Turning (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Claims (2)

  1. Vorrichtung zur Messung der Position (2) eines in einer Dreh- oder Schleifmaschine mechanisch zu bearbeitenden Werkstücks, die ein Längenmessgerät (4, 5) mit einer beweglichen Skala (4) und einen Ablesekopf (5) zur Übertragung eines Signals zur Angabe der linearen Position an die Steuerung (7) der Drehmaschsine, ein bewegliches Glied (6, 9) zur Mitnahme der Skala (4), das sich in Richtung (Z) der Achse des Werkstücks (3) bewegt, und eine Basis (20) an der Werkbank der Drehmaschine für die Anordnung der Messvorrichtung (1) umfasst, dadurch gekennzeichnet, dass sich das die Skala (4) mitnehmende bewegliche Glied (6, 9) bewegt und dabei das mechanisch zu bearbeitende Werkstück (3) vorschiebt sowie das freie Ende (3a) abtastet, während das Sugnal, das die Steuerung (7) vom Ablesekopf (5) erhält, die Endposition (2) des freien Endes (3a) des Werkstücks darstellt, um die Positionierung des Revolverkopfes (8) der Maschine festzusetzen.
  2. Vorrichtung zur Messung nach Anspruch 1, wobei das bewegliche Glied (6, 9) zur Abtastung des zu bearbeitenden Werkstücks (3) eine Platte (9) zur Abstützung des gleitbaren Skalenkörpers (4), eine Schieberachse (6) für das zu bearbeitende Werkstück (3), welche die Stützplatte (9) mitnimmt, eine Kolbenstange (10') für den Antrieb der Schieberachse (6) über eine Feder (19) zum Ausgleich des Weges sowie Mittel (18) zur Führung der Achse (6) während ihrer Bewegung bezüglich der Antriebsstange (10') umfasst.
EP19980500093 1997-05-09 1998-04-20 Vorrichtung zum Messung der Position eines Werkstückes in einer Drehmaschine Expired - Lifetime EP0877307B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9701007A ES2151780B1 (es) 1997-05-09 1997-05-09 Dispositivo para la medicion de la posicion de la pieza en un torno.
ES9701007 1997-05-09

Publications (3)

Publication Number Publication Date
EP0877307A2 EP0877307A2 (de) 1998-11-11
EP0877307A3 EP0877307A3 (de) 1999-12-01
EP0877307B1 true EP0877307B1 (de) 2003-08-06

Family

ID=8299252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980500093 Expired - Lifetime EP0877307B1 (de) 1997-05-09 1998-04-20 Vorrichtung zum Messung der Position eines Werkstückes in einer Drehmaschine

Country Status (3)

Country Link
EP (1) EP0877307B1 (de)
DE (1) DE69816904T2 (de)
ES (1) ES2151780B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES1041770Y (es) * 1999-01-26 2000-01-01 Danobat Dispositivo para la deteccion de la pieza en torreta de un torno.
EP1637256B1 (de) * 2004-09-15 2014-04-02 PIETRO CUCCHI S.p.A. Automatische Stangenzuführvorrichtung mit linearem Weggeber für die Lage des Stangenschiebers und automatische Drehmaschine mit einer solchen Stangenzuführvorrichtung
DE602007007449D1 (de) * 2007-05-29 2010-08-12 Tornos Sa Fabrique De Machine Verfahren zur Umsetzung einer zusätzlichen Formgebungsfunktion auf einer Bearbeitungsmaschine durch Abstecharbeit
CN111002105A (zh) * 2019-12-19 2020-04-14 苏州东昱精机有限公司 一种加工中心测距光学尺

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3446138A1 (de) * 1984-12-18 1986-06-19 Fortuna-Werke Maschinenfabrik Gmbh, 7000 Stuttgart Verfahren zur bestimmung der position eines werkstueckes in einer nc-gesteuerten maschine sowie eine nc-gesteuerte maschine zur durchfuehrung eines solchen verfahrens
JP2761785B2 (ja) * 1990-01-29 1998-06-04 津田駒工業株式会社 工作機械用万力
JPH05200601A (ja) * 1992-01-24 1993-08-10 Takizawa Tekkosho:Kk 工作機械

Also Published As

Publication number Publication date
ES2151780A1 (es) 2001-01-01
ES2151780B1 (es) 2002-01-16
EP0877307A2 (de) 1998-11-11
DE69816904T2 (de) 2004-06-09
DE69816904D1 (de) 2003-09-11
EP0877307A3 (de) 1999-12-01

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